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Note 3 - Loans and Allowance for Loan Losses - Recorded Investment in Nonperforming Loans (Details) - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
Loans and Leases Receivable, Net of Deferred Income, Total $ 517,633 $ 525,818
Real Estate Mortgage Portfolio Segment [Member] | Residential Loan [Member]    
Loans and Leases Receivable, Net of Deferred Income, Total 132,226 131,217
Real Estate Mortgage Portfolio Segment [Member] | Land Loan [Member]    
Loans and Leases Receivable, Net of Deferred Income, Total 18,187 17,328
Real Estate Mortgage Portfolio Segment [Member] | Commercial Real Estate Loan [Member]    
Loans and Leases Receivable, Net of Deferred Income, Total 133,480 135,114
Commercial Portfolio Segment [Member]    
Loans and Leases Receivable, Net of Deferred Income, Total 60,143 82,274
Consumer Portfolio Segment [Member] | Home Equity and Second Mortgage [Member]    
Loans and Leases Receivable, Net of Deferred Income, Total 52,456 52,001
Nonperforming Financial Instruments [Member]    
Nonaccrual Loans 1,332 1,406
Loans 90+ Days Past Due Still Accruing 52 59
Loans and Leases Receivable, Net of Deferred Income, Total 1,384 1,465
Nonperforming Financial Instruments [Member] | Real Estate Mortgage Portfolio Segment [Member] | Residential Loan [Member]    
Nonaccrual Loans 804 1,154
Loans 90+ Days Past Due Still Accruing 52 0
Loans and Leases Receivable, Net of Deferred Income, Total 856 1,154
Nonperforming Financial Instruments [Member] | Real Estate Mortgage Portfolio Segment [Member] | Land Loan [Member]    
Nonaccrual Loans 100 97
Loans 90+ Days Past Due Still Accruing 0 59
Loans and Leases Receivable, Net of Deferred Income, Total 100 156
Nonperforming Financial Instruments [Member] | Real Estate Mortgage Portfolio Segment [Member] | Construction Loans [Member]    
Nonaccrual Loans 0 0
Loans 90+ Days Past Due Still Accruing 0 0
Loans and Leases Receivable, Net of Deferred Income, Total 0 0
Nonperforming Financial Instruments [Member] | Real Estate Mortgage Portfolio Segment [Member] | Commercial Real Estate Loan [Member]    
Nonaccrual Loans 124 155
Loans 90+ Days Past Due Still Accruing 0 0
Loans and Leases Receivable, Net of Deferred Income, Total 124 155
Nonperforming Financial Instruments [Member] | Commercial Portfolio Segment [Member]    
Nonaccrual Loans 0 0
Loans 90+ Days Past Due Still Accruing 0 0
Loans and Leases Receivable, Net of Deferred Income, Total 0 0
Nonperforming Financial Instruments [Member] | Consumer Portfolio Segment [Member] | Home Equity and Second Mortgage [Member]    
Nonaccrual Loans 304 0
Loans 90+ Days Past Due Still Accruing 0 0
Loans and Leases Receivable, Net of Deferred Income, Total 304 0
Nonperforming Financial Instruments [Member] | Consumer Portfolio Segment [Member] | All Other Consumer Excluding Home Equity and Second Mortgage [Member]    
Nonaccrual Loans 0 0
Loans 90+ Days Past Due Still Accruing 0 0
Loans and Leases Receivable, Net of Deferred Income, Total $ 0 $ 0